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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbc2c4d1aae34e13ea356dbb65aed8a50d1cde9a25589c4c83815456196d909' 
  AND token = '2xc0LA+TnAy3UrhpzPvfKjk0ACbJ2CbKy1FN15yPAQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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