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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c9bf9ec9a6838a3418c903df7b5369f12d5057e1f873611af6971bac169f63' 
  AND token = '4P4OEylluj7zs7cA0b2J9wsMkTNoDnhBCzXTDSxryHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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