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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8b857dbea7e4daf5a97868ec345da7c99a5f58bb198f7573868f4daba6d959' 
  AND token = 'O+/xUysBqbW1hFibx+7Xksmag82PQScWTdAgFZCLMZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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