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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38b04e75c066b813ba8969fdd6627ff42848218ce9493a64d108693ce24ed67' 
  AND token = 'BKfF0N0NfkXNdRUuK9iEz7e5El7slOvK1xWd6t2QR/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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