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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2cb72dbf2d8b2c046c185b5d307723c02a5286d0d381c4052d5521b86f19ea5' 
  AND token = '4MG1zOxz7fNiYN4q4WpbPDb90lQqQkSF6S7ev/+oqaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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