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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbe3f4d748ee72149c4722d5c06ee09cafc6a19e197e4c716c7efe08253ce9c' 
  AND token = 'Zrv1bVMkqqDvITUjuq/0hPNPMgaT/agBlm/s7DTFkU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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