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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3faa32953cea5dd35238ea7582db9770e6fc8559e731f0c8c3b7eaf2ca3bf00e' 
  AND token = 'eT0JIX378qFUmYV1Q5n+cp40mDQJjdutcDyTEp7fFTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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