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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47778645de72fe87549b5260560a9d394c3c770d560173508ac53263b913e2c0' 
  AND token = 'v7vr7PuZ2z8qStE6Pj2LU0GbT54Z/6RJ+W5urgfm2xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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