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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f44d402d9a6940d1bcbc8c7d6520c4074059e4969988e89539f6d8efb9e5cc4' 
  AND token = 'ZH+VIKOBksr+HXfOasLaY2MXrxinBcl9lssPEpQtSVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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