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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d4de5e745423e163fe48be920a4f96110dd2768a78442e766fedaf5b1e61c9' 
  AND token = 'Jb5Ry/tzO9QcGcqgptaFc3LNQqbNgoBGmX/LtbiH3fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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