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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41cc863c1cb760098fe6ae5008af7caea1171274a8b219a95e076b76f397fa3' 
  AND token = 'H+WTxsFCBxGc8QTnbsBW8Rd590QPYzB3a+UKHF+e+yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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