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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11de962feec45388b17bed20e059fb6ab81295a91ef61f6611622008e61fcc59' 
  AND token = 'Z0wWUAcSWkjUZj7EtQnUahYUylgUBIf3bRr+1Z5o0u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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