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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d74120a7e84946ead3ec984a53a880a9c18a278a903374ab868be9213998d28' 
  AND token = 'Q5wm2WIslPWFcTIOdQP9mW4rLzTXWZ2XEGbSf7RLv7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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