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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd6e381d077a70b586f1d13a5a793668a22ad34f944ed8a908a2ee0988be8a3' 
  AND token = 'AQ5q1qzT705pGesM6fpE/zcZd/58qqI+YlsPawXlP8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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