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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938364ccd5890ec179cc5c1908aca87722b50b40457e828ecf9735585bafcdff' 
  AND token = 'oEqLoREb3ZfxeypHanbCPS9LBjdDKJ4eF9NBVxCWJHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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