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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dede6e540d8be01287f860b858a2e0bfed3f1528d66584fe46bb4fad015a9fa' 
  AND token = '/bo25enkij69xl4/pLQ39RAhEhEP4OpZSg4Mz7+Hkvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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