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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac8317ca3323126cd8a3363e4a9b04a13ea2943bf80eb72efbff2c3a91656d76' 
  AND token = 'A6QGk5o96exiKUazQT91l1gUTM3PQ4bAehOUvi8voPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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