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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137b489afa623bc370f76e29865fd93d2c0992f60ebdad18031398f91a1c3dc9' 
  AND token = 'is6dTZ54IPJtqP5OikiJIlNfn5WoGVIwQvN8mORg0RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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