SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf055c455a75ca6076b358df83b494d57a86fb0fbfc579da8a69493bbf2a2ab' 
  AND token = 'PszkBQSzGU3h9ZmvpVPI/wrAnSUjuw2yPZ/m+IfGm6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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