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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f094c175db8d082235a15f2f3cb1844c0a913b80e1b60ab784beac68097a7c4' 
  AND token = 'yrulzITCMApDsl0hPGYXeJZh3dtyWZbZqbZsfuzlT8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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