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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ae07e363a95177ca902801f1e3252486871cd7506638618dacfe090a3c8a49' 
  AND token = 'Uo4WPq+Pxvfalq9X+y4KVFgq7k7mbuxCJTt3qUH5s48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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