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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d448e9e43c1374cb4cadc3a04c17db80b75fba665aa2de18c96b37b83a5ae54' 
  AND token = '3PZjn/rqeW08aO8owuS+8YniRmbS3nGgPo4y51drEEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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