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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42853da20e5121828b30c56cc08fcff2c1dfa553952cebb53d8ae41e2c3a4c8' 
  AND token = 'yvT+KG/36r3gsnQEnqL7VgUlIv8a0sdICPpQ6iNcRNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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