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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0f145524ea191eeb3bc752ab314c2cc324e58f7ffd8b8739b204eac6a5df29' 
  AND token = 'qsLWXl8cuKTUlX2+HbHUlMHOxcGYkx+PADrdcwgglE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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