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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be959974f67225506a587c7f2f1ca816064c1d57b4f3ec6f97a1e9dcf161883c' 
  AND token = '9l4AWVlglAfvsKew6Er3dNkXHKtlgZS0S166vQG65es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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