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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d84d368d6c3fc7e61941b4b74565797b41e657f19a2c91e802c7dcfdc8743eb' 
  AND token = 'jXSC/3vIjbvje1f0kmfa00RnzrzRIae81TSE1utKW/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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