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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d37a7a1a316280dad2e48d57e6f956ac85fdc971f2837c0c23d004e0be8fcc' 
  AND token = 'S4XvL0uqREsK0+0kKjRz2PTsgvXbxyI7bEK2QH26zPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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