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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83eb9400307effae6697d2e0bb247c212513ef9851d6b2279e938797ba2a3e7' 
  AND token = 'FSpsZfDs0axx7cCAeio6X20F/N3wR83GpWH+pRSiutw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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