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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5338d6e43859ddb86b0b52e4e42cb9a6a76f4b125075d30174f3ea0432f3ef4' 
  AND token = '4WhPEQoFCmYa39pTNj4Um30R3NfJts39lCIOrccrttE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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