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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b75a7423fc7ba8756d7ecf00026e15712bf3b1577751e6c72736888a66710b' 
  AND token = 'SiR2i0tj8CVFWnpMv54Ow2hjggmtxzbw5/BRcw9cshY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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