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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fcc57cadf0dce48c0be1ab77a9f6b9c9c0dd4099bdee8521c92562fc4c39ee' 
  AND token = '1AQq+dFBgF0pbcPS6DNHieXdlF4gfrVvakQW2YWND34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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