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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26afda95729139e594ea2403581e000a58334138d4af4c316c3d5379e19697a8' 
  AND token = 'l3wb718hbQbSvouAe+JCKg+Gm5eHSCuDsb7hZunOpws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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