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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aba8b5bfa137f17f1cf3ae3a8319686a99fe70de8d939644f3f8c21ffc2295a' 
  AND token = '04DnbMS90tOIfg1aGkkOb8LG/9ol3WMAMUDRs44MrDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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