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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a61dc26d34f125367c3f6f333075c64792f491aaa031d079542f0220df2ae00' 
  AND token = 'TGAa2reNBsofK8D/xnNm2HBJ6udZyjBNLGBCeTfJZ2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}