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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97e3f5f0de7de00c0fece7b9337da9f49c155c40d04faf4f351baaacf8396eb' 
  AND token = 'llIjU2du2k0KBrEKRQnhgUkzl57oEUNEDoxWVkVEGGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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