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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24d523db39f4708d04c8ed206b41c5b49e832b0c8966f4ac92c9959e00137f6' 
  AND token = 'MrF3J9h+J9ewvLOwhtLLU9DpTtC/njhQ882hm7urRoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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