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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eead57c85248690901685710bb2b915865dabd835e1b3123fef9599110af946' 
  AND token = 'nU7rTTg8Qgape1ADNeOou/6FYyI+3THy4lPN1kMJbxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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