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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034e55e94a83e5b4af1339be80d1e5189a5e5d614a7bfadbdfbc460a3abaf14d' 
  AND token = '9HjF60P59ENkE9gNmhqepPK7OfYNgwYYOt31Uqn8ijo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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