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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c40730b253fc94243cc1d63ebd693397df0078f2a6378386de4856f6170d52b' 
  AND token = 'Lqx9RXzeE0/5a46h+rNvX2GldUNa6Hxde2PODySjBb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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