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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0122ba5af9f8fb014d96f517c4cfcb9085efbc581c2e6b1c9e236e698aa1bc' 
  AND token = 'qYWxAwsK4zgt9nkIZL3G8Z4qtzPcN+W5imx0RFgImP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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