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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80eb65c7b489bcfd67ca4a88075a27c18cc37ad7c71160fe67a35ff58a3c58aa' 
  AND token = 'Ws7k//LF38NhT8twj0nC8FIuFooVCgYkxiFZvue/WSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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