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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfbc2cb2d506ca89feaec60833b93dd20eba1cb61f75b56705c155ac00f0a26' 
  AND token = '46shK0NgJCJz0IF/xz0zxKS5zrdNqxDrvjbNu5usvsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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