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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20bd8dae8c2a9388b6a47f26d08985795789801dd6dcc7d80ce97b79e1e5859' 
  AND token = 'BIzSRdV6yBMPmOgWG5KQ/6lTJSt9gx8La70V9pdPIEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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