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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5681e384b49dc98c0f0d56718df29cb2f0b6b6c907773a81f79324665ca59e' 
  AND token = 'kHfGDGME8GJT5s3rSuE3HvlPrCcg11NEQXCH2EPpC/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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