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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c4bfb03fb8e3a45c58e21ea773a5773d92babcace805d09090707a77d6cc26' 
  AND token = 'o1Dx88kmFgeUcvoX84umO2sMpJ5Ad3S8R1oYbhtzKxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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