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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717250254ec5a032bbbe9ef36be9701abad6d6757ea801cb67d80bca35184272' 
  AND token = 'DG8vNzYaZ+NQmnKdMLyXo/bSHOTTG4xiRaoHt9mPRhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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