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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa664d988109032a1bd67e9eae3ab24e256ab8afcd796512d610e786a0e1e622' 
  AND token = 'cpX8e77wLgldYkuCDIdj3/ihWgrDhvBCS73EFWl7Y2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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