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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177fab941561c2ce1a5bbfddff9087b8ddd3629d98b9010aa928b3502bb9943a' 
  AND token = 'lohPcXvBZJiOXWmcJHfGE3b93a6xKdfEyvR87fgpGVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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