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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5adaf15ce4488b0f6e92d1a79b6759dbf47aba8f5cbfabe8d3c84a4afde0ff61' 
  AND token = 'CCrMMliciRmL56dGG3l7F5ZCmF+kDJxG3jCskUlPleA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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