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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ddba8650ea38de87b3695335d01112b8f28902796a0ff0370bd4e5b0c9d9895' 
  AND token = '4xPs7HWJxX+6nNOn2Tm1kVy1AYtWqFyF1EZEJbUParY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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