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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6d75d92a7aa9e274cef0e90e2715fd3a39783915980579efe14e79bfebcff6' 
  AND token = '8j83TW94aDIMc7W+bIZ2FAJ8ePkp+A0eRYGYlVzVjZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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