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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60036b8c1b76f3eaf91b8fa19809eba0faf1fba0a4fa16ac8250f0ba1acbdc58' 
  AND token = 'idDPy7J08cMe6DUh8k2WO+055cqzYtJvt7CwQOg5M5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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