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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab39ce241f2eab3c1951912bb1dffe28e22aeef3f54abdb6f15bac478b10aa9a' 
  AND token = 'UCBy3N3V/ie7VyZoERrcU6Xy1lazcpr1PzK21GFOv/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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