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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c543096c98dde4f37b5bc21d0947c92657ed62f69ad73de9c76c9e645c5ca0ee' 
  AND token = '0JkKgrSPNT6Eub9Z7WfP2dSMJ+uWbLirwY8SWe22Y6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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