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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f01e9eb906c2f17ab0b496a98da6396ac98fc80eb5b4544ca85faa9ad558e6c' 
  AND token = '03VOl2ein4qsi2iGUi35J81l7hxDMBja7KvpMm626lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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