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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9183dbc731599600b0dc0acd863b337cb0112f7aeab0804d408f545816a66274' 
  AND token = 'MC/PoR61usGY6iMrfHrR3rMR7pHy/aJEeAG6tcpBouc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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