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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e69b65f47f0025fa49bd80955d3c4f4631e0e10f6a9ca6df4fdb38aa49c960' 
  AND token = 'ZE0siIiP7ExHXFlX/P0i/xpT3qV2XSPNygTlwyvnbLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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