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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7fc87f5773f1a553c4a6149d8ec3f99b6bf28b4bb8444dbcfa995d298d6fbe' 
  AND token = '2ARBatlEDP6znRdi1nLX22JYVm0SEb4QQztWklMGb5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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