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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3739a15d04908d8f98064777be9edc3b0bf05858be3e6c9ea36746918c3f7a5b' 
  AND token = '2n3azttMbPz3it+uKEpjOkB9o8ByJWHWIyL7urEijvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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