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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d40a490b748a2b9ef23350236178bc258e00331b47186ee9d142cfb15cf9acf' 
  AND token = 'cXKi9U1oSTHiRB1EfAh/QvFIuWram5qHpDwyO5TLEXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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