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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd477d5f9e015faf4a38c1faa0dbd6bcd1122c65d327973aa84835ef2daf30764' 
  AND token = 'sJmpa7rWCNtlzbaezcNlJPL+SAsAHm+QPKdf6yn+ry8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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