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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f4101a73aaf470cd5b7a46f410be82b50cb3ad3b33a276ca12b8fac442e4c9' 
  AND token = 'X8Ut0KluPCDOLaf5AddANiNLwP6I18lp9MhQ1IxIOxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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