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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4159569aa85f2c0e4938ecdf1dbfb332bc849c54b22136d6a0ba7e0ca705bc4b' 
  AND token = '0ym/rbwUrm7+63m8Fwf0d9YkrqwJP74mEIW+cPDmIGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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